JP7044303B2 - Pipeline branching system and pipeline branching method - Google Patents

Description

The present invention relates to a pipeline branching system and a pipeline branching method, and more particularly to a pipeline branching system and a pipeline branching method for branching a pipeline in a state where a fluid such as gas is flowing.

In recent years, a technique for attaching a branch pipeline while flowing a fluid has been put into practical use for a main pipeline through which a fluid such as city gas flows.
For example, Patent Document 1 proposes a branch take-out method using a no-blow bag. In this branch take-out method, first, a take-out jig such as a drilling device is attached to a predetermined position of the pipe for drilling, then the take-out jig is removed with the no-blow bag attached, and the drilled opening is temporarily filled. Install the stop plug. Subsequently, the service cheese is attached to the opening instead of the temporary fixing plug, the no-blow bag is removed, and a new pipe is extended from the service cheese outlet. Then, with the no-blow bag attached, remove the service cheese stopper and attach the plug to the service cheese tube end. By attaching the no-blow bag and performing the work in this way, it is possible to branch the pipe relatively safely without stopping the flow of the fluid in the pipe.

Japanese Unexamined Patent Publication No. 2001-082672

However, in the branch extraction method of Patent Document 1, it is necessary to repeatedly attach and detach the no-blow bag in order to prevent fluid leakage, and it is difficult to easily suppress fluid leakage.

The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a pipeline branching system and a pipeline branching method for easily suppressing fluid leakage.

The pipeline branching system according to the present invention includes a joint for connecting the branch pipeline to the main pipeline through which the fluid flows, and an opening / closing device attached to the joint. The opening / closing device is attached to the joint and communicates within the joint. A valve seat formed with a connecting passage, and an outer surface formed in a plate shape and slidably arranged on the valve seat so as to open and close the connecting passage, and formed on the inner surface facing the joint and the outer surface formed on the opposite side of the inner surface. It has a shutter having a shutter and a sealing member arranged between the outer surface of the shutter and the valve seat, and the valve seat responds to the pressure of the fluid flowing into the joint through the through hole formed in the main pipeline. It movably supports the shutter so that it is pressed against the seal member.

Here, the seal member is the first seal member, and the opening / closing device is arranged between the inner surface of the shutter and the valve seat, and the second seal member is formed to have a smaller cross-sectional area than the first seal member. It is preferable to have.

Further, the valve seat is formed so that a drilling device for forming a through hole in the main pipeline can be attached, and the shutter can be arranged so as to open and close a communication passage extending between the drilling device and the joint.

Further, the valve seat has a space for sliding the shutter, and the surface of the space is formed so as to be in contact with the inner surface of the shutter and to be movablely separated from the outer surface of the shutter according to the pressure of the fluid. Is preferable.

In addition, the valve seat has a space formed with a constant width throughout, and can support the shutter so as to be translateable.
Further, the valve seat is formed so that the width of the back side of the shutter is larger than that of the entrance / exit side in the space, and the valve seat can be movably supported so as to incline the shutter.

Further, the shutter has a moving portion in which a portion corresponding to the communication passage is movably arranged on the seal member side, and a shutter main body that supports the moving portion. In the valve seat, the surface of the space is the outer surface of the shutter main body. The moving portion can be formed so as to be close to the moving portion and movably separated from the outer surface of the moving portion.

Further, the opening / closing device has a clamp portion that is arranged so as to surround the outer surface of the portion to which the joint is attached and fastens and fixes the opening / closing device and the joint from the outside, and a fitting portion that protrudes from the outer surface of the portion to which the joint is attached. The fitting portion has a fitting-side inclined surface that inclines toward the joint side in the protruding direction, and the clamp portion has a clamp-side inclined surface that inclines along the fitting-side inclined surface. It can be fitted to the fitting portion so as to increase the contact portion between the inclined surface on the clamp side and the inclined surface on the fitting side according to the tightening.

In the pipeline branching method according to the present invention, a branch pipeline is connected to a main pipeline through which a fluid flows via a joint, an opening / closing device is attached to the joint, and a communication passage formed in a valve seat of the opening / closing device is inside the joint. A shutter that is formed in a plate shape and is slidably arranged on the valve seat so as to open and close the communication passage, and has an inner surface facing the joint and an outer surface formed on the opposite side of the inner surface. The shutter, which is closed and supported by the valve seat so as to be movable toward the sealing member placed between the outer surface of the shutter and the valve seat, is subjected to the pressure of the fluid flowing into the joint through the through hole formed in the main pipeline. The fluid is circulated to the branch pipeline by being pressed against the seal member accordingly.

Here, after the switchgear is attached to the joint and the communication passage communicates in the joint, the drilling device is attached to the valve seat, the shutter is opened, the drilling device is connected into the joint through the communication passage, and the drilling device is used in the main pipeline. It is preferable to form a through hole.

According to the present invention, the valve seat movably supports the shutter so that it is pressed against the seal member in response to the pressure of the fluid flowing into the joint through the through hole formed in the main pipeline, so that the fluid leaks. It becomes possible to provide a pipeline branching system and a pipeline branching method that easily suppresses the above.

It is a figure which shows the structure of the pipeline branching system which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure of a switchgear. It is sectional drawing which shows how the valve seat supports a shutter movably. It is a figure which shows the state which attaches the branch pipeline and a switchgear to a main pipeline. It is a figure which shows the state which the through hole is formed in the main pipeline. It is a figure which shows how the plug is fitted in the opening of a joint. It is sectional drawing which shows the structure of the switchgear of Embodiment 2. It is sectional drawing which shows the structure of the valve seat of Embodiment 3. FIG. It is sectional drawing which shows the structure of the valve seat of Embodiment 4. It is sectional drawing which shows the structure of the shutter and the valve seat of Embodiment 5.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1
FIG. 1 shows the configuration of the pipeline branching system according to the first embodiment of the present invention. This pipeline branching system has a fixing portion 1 fixed to a main pipeline T1 through which a fluid flows, a joint 2 connected to the fixing portion 1, and a switchgear 3 attached to the joint 2.

The fixed portion 1 is a so-called split sleeve, has a pipe shape that surrounds the main pipeline T1, and is formed so as to be divided in a direction orthogonal to the main pipeline T1 at the central portion thereof. A stopper 4 is arranged at the divided portion, and the fixing portion 1 is stopped so as not to come off from the main pipeline T1. Further, the fixing portion 1 is provided with a protruding portion 5 for connecting the joint 2. The protrusion 5 is formed with an opening that communicates with the through hole H formed in the main pipeline T1.

The joint 2 is a so-called service team and has three connecting portions 6a, 6b and 6c. The connecting portion 6a is formed so as to project toward the fixed portion 1, and the connecting portion 6b is formed so as to project toward the opposite side of the connecting portion 6a. Further, the connecting portion 6c is formed so as to project laterally from between the connecting portion 6a and the connecting portion 6b. Then, the connecting portion 6a is connected to the protruding portion 5 of the fixing portion 1, the connecting portion 6b is connected to the opening / closing device 3, and the connecting portion 6c is connected to the branch pipeline T2. Openings 7a, 7b and 7c are formed in the connecting portions 6a, 6b and 6c, respectively, and the main pipeline T1, the switchgear 3 and the branch pipeline T2 communicate with each other via the openings 7a to 7c. ..

The switchgear 3 has a clamp portion 8, mounting portions 9a and 9b, a valve seat 10, and a shutter 11. As shown in FIG. 2, the mounting portion 9a, the valve seat 10 and the mounting portion 9b are arranged so as to sequentially overlap each other, and a communication passage 12 penetrating the mounting portion 9a, the valve seat 10 and the mounting portion 9b is formed inside the mounting portion 9a, the valve seat 10 and the mounting portion 9b. Has been done.

The mounting portion 9a is for mounting the valve seat 10 to the joint 2, and the connecting portion 6b of the joint 2 is fitted into the mounting portion 9a. As a result, the communication passage 12 formed in the mounting portion 9a is communicated into the joint 2 via the opening 7b.
The attachment portion 9b is for attaching an external device to the valve seat 10, and is formed so that an external device such as a drilling device for forming a through hole H in the main pipeline T1 can be attached.

The valve seat 10 has an inner valve seat 10a arranged between the mounting portion 9a and the mounting portion 9b and fixed to the mounting portion 9a, and an outer valve seat 10b fixed to the mounting portion 9b. The valve seat 10 is attached to the connection portion 6b of the joint 2 via the attachment portion 9a, whereby the communication passage 12 formed in the valve seat 10 is communicated into the joint 2.
The shutter 11 is formed in a plate shape and is slidably arranged between the inner valve seat 10a and the outer valve seat 10b so as to open and close the communication passage 12 formed in the valve seat 10. Further, the shutter 11 has an inner surface 13a facing the joint 2 with the mounting portion 9a interposed therebetween, and an outer surface 13b formed on the opposite side of the inner surface 13a.
The clamp portion 8 is arranged so as to surround the outer periphery of the connection portion 6b and the mounting portion 9a of the joint 2, and the connection portion 6b and the mounting portion 9a are fastened and fixed from the outside.

Next, the configurations of the valve seat 10 and the shutter 11 will be described in detail.
As shown in FIG. 3A, a space 14 for sliding the shutter 11 is formed in the valve seat 10, and a central side sealing member 15 and a pair of entrance / exit side sealing members are exposed in the space 14. 16a and 16b are arranged.

The central side seal member 15 is arranged between the outer surface 13b of the shutter 11 and the lower surface of the outer valve seat 10b in the vicinity of the communication passage 12. The central side sealing member 15 has a circular cross section, and is formed in an annular shape so as to surround the communication passage 12.
The doorway side seal members 16a and 16b are arranged in the vicinity of the doorway 11a where the shutter 11 is taken in and out, and are formed so as to extend along the doorway 11a. The entrance / exit side seal member 16a is arranged between the inner surface 13a of the shutter 11 and the upper surface of the inner valve seat 10a, and the entrance / exit side seal member 16b is arranged between the outer surface 13b of the shutter 11 and the lower surface of the outer valve seat 10b. Has been done. The entrance / exit side seal members 16a and 16b can be made of, for example, round packing.

The space 14 of the valve seat 10 is formed to be larger than the thickness of the shutter 11. Specifically, the space 14 is formed with a width such that a gap is formed between the shutter 11 and the lower surface of the outer valve seat 10b, that is, the surface of the space 14 comes into contact with the inner surface 13a of the shutter 11 and the shutter 11 moves. It is formed so as to be preferably separated from the outer surface 13b of the shutter 11 (see FIG. 3A). As a result, the valve seat 10 can move the shutter 11 so that the shutter 11 is pressed against the central seal member 15 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. Can be supported by. That is, as shown in FIG. 3B, the valve seat 10 supports the shutter 11 so as to move toward the central seal member 15 in response to the pressure of the gas G from the inner surface 13a side of the shutter 11. Here, in the valve seat 10, the space 14 is formed with a constant width as a whole, and supports the shutter 11 so as to be translateable.

Next, the pipeline branching method of this embodiment will be described.
First, as shown in FIG. 4A, the fixing portion 1 is fixed to the main pipeline T1 through which the gas G flows, the connecting portion 6a of the joint 2 is connected to the protruding portion 5, and the connecting portion 6c of the joint 2 is connected. The branch pipeline T2 is connected. As a result, the branch pipeline T2 is connected to the main pipeline T1 via the joint 2.
Here, an airtightness test is carried out for all the spaces of the joint 2 and the branch pipeline T2. It is confirmed that the fluid does not leak from between the 5 and the like.

When the airtightness of the joint 2 and the branch pipeline T2 is confirmed, the switchgear 3 is attached to the connection portion 6b of the joint 2 as shown in FIG. 4 (b). At this time, as shown in FIG. 2, the switchgear 3 is attached so that the communication passages 12 formed in the attachment portion 9a, the valve seat 10 and the attachment portion 9b communicate with each other in the joint 2 via the opening portion 7b. ..
After that, as shown in FIG. 5A, the drilling device P is attached to the attachment portion 9b of the opening / closing device 3. When the drilling device P is attached, as shown in FIG. 5B, the shutter 11 of the opening / closing device 3 is slid to open the communication passage 12, and the drilling device P is connected to the joint 2 through the communication passage 12. .. The hole saw portion Pa is made to enter the joint 2 from the drilling device P through the open passage 12, and then the hole saw portion Pa is made to enter the fixed portion 1 through the opening 7a of the joint 2. When the hole saw portion Pa that has entered the fixed portion 1 comes into contact with the main pipeline T1, a through hole H is formed in the main pipeline T1 as it is.

When the through hole H is formed in the main pipeline T1 in this way, the hole saw portion Pa is returned to the drilling device P and removed from the inside of the fixing portion 1, the joint 2, and the opening / closing device 3. Here, the gas G flowing through the main pipeline T1 not only flows into the branch pipeline T2 from the through hole H formed in the main pipeline T1 through the fixing portion 1 and the joint 2, but also is a continuous passage of the switchgear 3. It also flows into 12.

Therefore, as shown in FIG. 3A, by sliding the shutter 11 to close the communication passage 12 formed in the valve seat 10, it is possible to prevent the gas G from leaking from the communication passage 12 to the outside. .. Since the shutter 11 is slidably arranged on the valve seat 10 in this way, the leakage of the gas G can be easily suppressed only by sliding the shutter 11.
Further, as shown in FIG. 3B, the shutter 11 is supported by the valve seat 10 so as to move according to the pressure of the gas G flowing into the joint 2 from the through hole H of the main pipeline T1. Therefore, the shutter 11 is pressed against the central seal member 15 according to the pressure of the gas G, and the gas G can be reliably suppressed from flowing out from the gap between the shutter 11 and the valve seat 10.

In this way, when the shutter 11 is slid to close the communication passage 12 of the valve seat 10, the drilling device P is removed from the mounting portion 9b of the opening / closing device 3, and as shown in FIG. 6, the mounting portion 9b is removed. No blow bag N is attached. Subsequently, the shutter 11 is opened again, and the plug L is fitted into the opening 7b of the joint 2 via the communication passage 12 of the opening / closing device 3. When the opening 7b of the joint 2 is closed by the plug L, the no-blow bag N and the opening / closing device 3 are removed from the joint 2. As a result, the gas G flowing through the main pipeline T1 flows into only the branch pipeline T2, and the main pipeline T1 can be branched at the branch pipeline T2.

According to the present embodiment, since the shutter 11 is slidably arranged so as to open and close the communication passage 12 formed in the valve seat 10, gas G can easily leak from the communication passage 12 to the outside. It can be suppressed.
Further, since the shutter 11 is movably supported so as to be pressed against the central seal member 15 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1, the continuous passage. Leakage of gas G from 12 to the outside can be reliably suppressed.

Embodiment 2
In the first embodiment described above, it is preferable that the clamp portion 8 firmly fixes the connecting portion 6b and the mounting portion 9a of the joint 2.
For example, as shown in FIG. 7A, the clamp portion 21 can be arranged in place of the clamp portion 8 of the first embodiment, and the attachment portion 22 can be arranged in place of the attachment portion 9a.

The mounting portion 22 has a fitting portion 23 in which the outer surface of the portion to which the connecting portion 6b of the joint 2 is mounted projects laterally. The fitting portion 23 is formed so that the fitting side inclined surface 23a facing the valve seat 10 side is inclined toward the joint 2 side in the projecting direction. Further, in the mounting portion 22, a packing 22a that abuts on the connecting portion 6b is arranged on the lower surface of the joint 2 facing the connecting portion 6b. The packing 22a is formed in an annular shape corresponding to the edge portion of the connecting portion 6b.

The clamp portion 21 has a main body portion 24, a lock guide 25, and an elastic body 26.
The main body portion 24 is arranged so as to surround the outer surface of the connection portion 6b and the mounting portion 22 of the joint 2, and the connection portion 6b and the mounting portion 22 are fastened and fixed from the outside. The main body 24 is formed with a plurality of protrusions 27 at the ends of the joint 2 facing the connection portion 6b.

The lock guide 25 is arranged inside the main body portion 24 so as to face the fitting portion 23 of the mounting portion 22, and is formed in an annular shape along the fitting portion 23. The lock guide 25 has a clamp-side inclined surface 25a that abuts on the fitting-side inclined surface 23a of the fitting portion 23, and the clamp-side inclined surface 25a is inclined along the fitting-side inclined surface 23a of the fitting portion 23. It is formed to do.
The elastic body 26 is arranged inside the main body portion 24 so as to sandwich the lock guide 25 with the fitting portion 23. The elastic body 26 is formed in an annular shape along the lock guide 25.

With such a configuration, when the connecting portion 6b and the mounting portion 22 are tightened by the main body portion 24 of the clamp portion 21, the lock guide 25 and the fitting portion 23 have the clamp side inclined surface 25a as shown in FIG. 7 (b). And the fitting side inclined surface 23a is moved and fitted so as to increase the contact portion. As a result, the joint 2 and the mounting portion 22 can be firmly fixed.
Further, according to the fitting of the lock guide 25 and the fitting portion 23, the main body portion 24 is deformed so as to reduce the diameter inward. As a result, the mounting portion 22 is moved so as to press the packing 22a against the connecting portion 6b of the joint 2, and the plurality of protruding portions 27 are pressed against the connecting portion 6b. By pressing the connecting portion 6b against the packing 22a in this way, it is possible to prevent the gas G from leaking to the outside from between the connecting portion 6b and the mounting portion 22. Further, by pressing the plurality of protrusions 27 against the connecting portion 6b, the joint 2 and the mounting portion 22 can be firmly connected.

Here, when a through hole H is formed in the main pipeline T1 and the shutter 11 is moved so as to be pressed against the central seal member 15 of the valve seat 10 in response to the pressure of the gas G, the mounting portion 22 is moved to the lock guide 25. Slightly moves to the valve seat 10 side along the clamp side inclined surface 25a. As a result, it is possible to prevent the shutter 11 from being suddenly pressed against the central seal member 15 in response to the pressure of the gas G, and the shutter 11 can be pressed against the central seal member 15 in an appropriate posture.

According to the present embodiment, the clamp portion 21 moves so that the lock guide 25 and the fitting portion 23 increase the contact portion between the clamp side inclined surface 25a and the fitting side inclined surface 23a according to the tightening of the main body portion 24. Since it is fitted, the joint 2 and the mounting portion 22 can be firmly fixed.

Embodiment 3
In the above embodiments 1 and 2, the central seal member 15 is arranged only between the outer surface 13b of the shutter 11 and the lower surface of the outer valve seat 10b, but the inner surface 13a and the inner valve seat 10a of the shutter 11 are arranged. It can also be further placed between the top surface.
For example, as shown in FIG. 8, the central side sealing member 31 can be arranged in the first embodiment.

The central side seal member 31 is arranged at a position corresponding to the central side seal member 15 between the inner surface 13a of the shutter 11 and the upper surface of the inner valve seat 10a. Here, the central side seal member 31 is formed so that the cross-sectional area is smaller than that of the central side seal member 15.

With such a configuration, the shutter 11 moves so as to be pressed against the central seal member 15 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. At this time, since the central side sealing member 31 is arranged on the inner surface 13a side of the shutter 11, it is possible to more reliably suppress the leakage of the gas G from the communication passage 12 to the outside. Further, since the shutter 11 is pressed against the central seal member 15 to suppress the leakage of the gas G, the leakage of the gas G increases more than a predetermined value even if the cross-sectional area of the central seal member 31 is made small. By forming the cross-sectional area of the central seal member 31 small, the configuration of the valve seat 10 can be simplified.

According to the present embodiment, since the central seal member 31 having a cross-sectional area smaller than that of the central seal member 15 is arranged between the inner surface 13a of the shutter 11 and the valve seat 10, the communication passage 12 is directed to the outside. Leakage of gas G can be suppressed more reliably with a simple configuration.

Embodiment 4
In the above embodiments 1 to 3, the space 14 of the valve seat 10 is formed with a constant width, but it is sufficient if the shutter 11 can be moved so as to be pressed against the central seal member 15, and is limited to a constant width. It's not a thing.
For example, as shown in FIG. 9, the space 41 can be formed in place of the space 14 of the valve seat 10 of the first embodiment. The space 41 is formed so that the width of the space 41 is larger than that of the doorway 11a on which the shutter 11 is taken in and out, and the space 41 can be movably supported so as to incline the shutter 11.

With such a configuration, the shutter 11 moves so as to be pressed against the central seal member 15 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. At this time, the shutter 11 is pressed against the central side seal member 15 in a posture in which the back side moves greatly with respect to the doorway 11a side and is inclined diagonally.

According to the present embodiment, the shutter 11 is tilted diagonally according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1 on the central seal member 15. Since it is movably supported so as to be pressed, it is possible to reliably suppress the leakage of the gas G from the communication passage 12 to the outside.

Embodiment 5
In the above embodiments 1 to 4, the shutter 11 is formed so as to move as a whole according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. It suffices if it can be moved so as to be pressed against the side seal member 15, and the whole is not limited to the one that moves.
For example, as shown in FIG. 10, the shutter 51 can be arranged in place of the shutter 11 of the first embodiment, and the space 52 can be formed in place of the space 14 of the valve seat 10.

The shutter 51 has a moving portion 53a and a shutter main body 53b that supports the moving portion 53a in a portion of the valve seat 10 corresponding to the communication passage 12. The moving portion 53a is urged toward the inner valve seat 10a with respect to the shutter main body 53b so as to be movable toward the central side sealing member 15 according to the pressure of the gas G. That is, the moving portion 53a is urged so as to be located in the same plane as the shutter main body 53b when the pressure of the gas G is not generated.
The space 52 of the valve seat 10 has a wide portion corresponding to the moving portion 53a of the shutter 51, that is, a width such that the lower surface of the outer valve seat 10b is separated from the outer surface 13b of the moving portion 53a so that the moving portion 53a can move. The other part is formed with a width close to the outer surface 13b of the shutter main body 53b.

With such a configuration, the moving portion 53a of the shutter 51 moves in the space 52 of the valve seat 10 on the central side in response to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. It is pressed against the seal member 15. At this time, the shutter body 53b is hardly moved because the space 52 of the valve seat 10 is formed to have a width substantially the same as the thickness of the shutter body 53b. As a result, while maintaining the sealing property at the entrance / exit 11a of the shutter 51, the moving portion 53a is pressed against the central side sealing member 15, so that the leakage of the gas G from the communication passage 12 to the outside can be reliably suppressed.

According to the present embodiment, the shutter 51 has a moving portion 53a corresponding to the communication passage 12 of the valve seat 10 according to the pressure of the gas G flowing into the joint 2 from the through hole H formed in the main pipeline T1. Since only the fan moves so as to be pressed against the central seal member 15, it is possible to more reliably suppress the leakage of the gas G from the communication passage 12 to the outside.

1 Fixing part 2 Fitting 3 Opening and closing device 4 Stopper 5 Protruding part 6a, 6b, 6c Connection part 7a, 7b, 7c Opening part 8,21 Clamp part 9a, 9b, 22 Mounting part 10 Valve seat 10a Inner valve seat 10b Outer valve Seat 11,51 Shutter 11a Doorway 12 consecutive passages 13a Shutter inner surface 13b Shutter outer surface 14,41,52 Space 15,31 Central side seal member 16a, 16b Doorway side seal member 23 Fitting part 23a Fitting side inclined surface 22a Clamping 24 Main body 25 Lock guide 25a Clamp side inclined surface 26 Elastic body 27 Multiple protrusions 53a Moving part 53b Shutter body T1 Main pipeline T2 Branch pipeline H Through hole G Gas P Punching device Pa Holsaw section N No blow bag L plug

Claims (5)

A joint that connects a branch pipeline to the main pipeline through which fluid flows,
A switchgear attached to the joint is provided.
The switchgear
A valve seat attached to the joint and having a communication passage in the joint,
A shutter formed in a plate shape and slidably arranged on the valve seat so as to open and close the communication passage, and having an inner surface facing the joint and an outer surface formed on the opposite side of the inner surface.
It has a sealing member arranged between the outer surface of the shutter and the valve seat, and has.
The valve seat has a space for sliding the shutter, and the shutter closed in response to the pressure of the fluid is formed so as to be movable in the space toward the seal member.
The valve seat movably supports the shutter so that the shutter is pressed against the seal member in response to the pressure of the fluid flowing into the joint through the through hole formed in the main pipeline.
The valve seat is formed so as to have a width larger than the entrance / exit side of the shutter in the space, and is movably supported so as to incline the shutter . A joint that connects a branch pipeline to the main pipeline through which fluid flows,
A switchgear attached to the joint is provided.
The switchgear
A valve seat attached to the joint and having a communication passage in the joint,
A shutter formed in a plate shape and slidably arranged on the valve seat so as to open and close the communication passage, and having an inner surface facing the joint and an outer surface formed on the opposite side of the inner surface.
It has a sealing member arranged between the outer surface of the shutter and the valve seat, and has.
The shutter has a moving portion in which a portion corresponding to the communication passage is movably arranged on the side of the sealing member, and a shutter main body that supports the moving portion.
The valve seat has a space for sliding the shutter, and a portion of the space corresponding to the moving portion is formed wide so that the moving portion can move and penetrates formed in the main pipeline. The outer surface of the moving portion is separated from the outer surface of the shutter body in response to the pressure of the fluid flowing into the joint from the hole, and the outer surface of the moving portion is pressed against the sealing member. The pipeline branching system. The seal member is a first seal member and is a seal member.
The switchgear
The pipeline branching system according to claim 1 or 2 , further comprising a second sealing member arranged between the inner surface of the shutter and the valve seat and having a cross-sectional area smaller than that of the first sealing member. The valve seat is formed so that a drilling device for forming the through hole can be attached to the main pipeline.
The pipeline branching system according to any one of claims 1 to 3 , wherein the shutter is arranged so as to open and close the communication passage extending between the drilling device and the joint. The switchgear is arranged so as to surround the outer surface of the portion to which the joint is attached, and includes a clamp portion for tightening and fixing the switchgear and the joint from the outside, and a fitting portion protruding from the outer surface of the portion for attaching the joint. Have,
The fitting portion has a fitting-side inclined surface that inclines toward the joint side in the projecting direction.
The clamp portion has a clamp-side inclined surface that is inclined along the fitting-side inclined surface, and the contact portion between the clamp-side inclined surface and the fitting-side inclined surface is increased according to the tightening of the clamp portion. The pipeline branching system according to any one of claims 1 to 4 , which is fitted to the fitting portion.

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